Thermal Expansion Alloys

Thermal expansion alloys, such as Invar and Kovar, are made up of an iron-nickel base and are known for their low coefficient of thermal expansion (CTE). Iron and nickel have very similar CTE, however with these alloys, thermal expansion is affected by the addition of nickel to iron. 

Mechanical Properties

Alloy Tensile Strength   Yield Strength (0.2%)   Hardness   Hardness  
PSI x 103
PSI x 103
Rockwell B (HRC)
Rockwell C (HRC)
Invar
65
40
70
-
Kovar
75
50
68
-

 

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Last updated 12.10.2023